Lighting is a functional part of what they advertise it to do, if its inadequate then its not fit for purpose.
They might say many microwaves are poorly lit, you just retort that you take that as an admission of poor design and is not your problem - its the manufacturer's and retailer's problem.
In a time of universal deceit - telling the truth is a revolutionary act. George Orwell
When the debate is lost, slander becomes the tool of the loser. Socrates